Apparatus

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sensors Mode-S transponder

AACC5B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N795UA · BOEING 777-200 · operated by UNITED AIRLINES INC

Hex
AACC5B
Octal
52546133
Decimal
11,193,435
Country
US
Tail
N795UA
Type
B772
Broadcasting now · callsign UAL121 · 38,000 ft
Flights observed
272
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Current position

AACC5B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AACC5B falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
UAL4 United Airlines 13 2026-05-23
UAL22 United Airlines 9 2026-06-25
UAL18 - 9 2026-06-24
UAL919 - 8 2026-07-09
UAL58 United Airlines 8 2026-07-21
UAL915 United Airlines 7 2026-05-29
UAL884 - 7 2026-07-07
UAL47 United Airlines 7 2026-05-16
UAL948 United Airlines 6 2026-05-22
UAL943 United Airlines 6 2026-05-27
UAL942 United Airlines 6 2026-05-27
UAL939 United Airlines 6 2026-05-04
UAL880 United Airlines 6 2026-07-26
UAL852 United Airlines 6 2026-07-21
UAL819 - 6 2026-07-02
UAL71 United Airlines 6 2026-06-04
UAL56 United Airlines 6 2026-06-23
UAL5 United Airlines 6 2026-05-17
UAL19 - 6 2026-06-23
UAL990 - 5 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL880 IAH → LHR Jul 26, 21:40 UTCJul 26, 22:45 UTC1h 5m
2026-07-26 UAL879 LHR → IAH Jul 26, 09:20 UTCJul 26, 18:45 UTC9h 25m
2026-07-25 UAL14 EWR → LHR Jul 25, 23:35 UTCJul 26, 05:47 UTC6h 12m
2026-07-25 UAL14 EWR → LHR Jul 25, 23:25 UTCJul 26, 06:05 UTC6h 40m
2026-07-24 UAL366 DEN → AUS Jul 24, 21:12 UTCJul 25, 01:47 UTC4h 35m
2026-07-24 UAL366 DEN → AUS Jul 24, 21:15 UTCJul 25, 01:55 UTC4h 40m
2026-07-23 UAL673 SFO → BOS Jul 23, 14:45 UTCJul 24, 02:35 UTC11h 50m
2026-07-23 UAL673 SFO → BOS Jul 23, 14:31 UTCJul 24, 02:29 UTC11h 58m
2026-07-23 UAL672 EWR → ATL Jul 23, 01:20 UTCJul 23, 11:55 UTC10h 35m
2026-07-22 UAL59 FRA → SFO Jul 22, 11:30 UTCJul 22, 22:25 UTC10h 55m
2026-07-21 UAL58 SFO → FRA Jul 21, 22:27 UTCJul 22, 08:27 UTC10h 0m
2026-07-21 UAL58 SFO → FRA Jul 21, 22:40 UTCJul 22, 01:30 UTC2h 50m
2026-07-21 UAL852 TPE → SAN Jul 21, 08:20 UTCJul 21, 18:15 UTC9h 55m
2026-07-21 UAL852 TPE → SAN Jul 21, 06:50 UTCJul 21, 07:05 UTC15m
2026-07-20 UAL853 SFO → TPE Jul 20, 19:30 UTCJul 20, 19:55 UTC25m
2026-07-20 UAL853 SFO → TPE Jul 20, 07:45 UTCJul 20, 18:25 UTC10h 40m
2026-07-19 UAL673 - Jul 19, 14:50 UTCJul 19, 16:45 UTC1h 55m
2026-07-19 UAL673 SFO → BOS Jul 19, 14:51 UTCJul 20, 02:18 UTC11h 27m
2026-07-19 UAL672 SFO → BCN Jul 19, 02:00 UTCJul 19, 12:30 UTC10h 30m
2026-07-18 UAL34 KIX → SFO Jul 18, 08:10 UTCJul 18, 18:20 UTC10h 10m
2026-07-17 UAL35 SFO → KIX Jul 17, 18:35 UTCJul 18, 05:29 UTC10h 54m
2026-07-17 UAL35 SFO → KIX Jul 17, 18:50 UTCJul 18, 05:25 UTC10h 36m
2026-07-16 UAL673 - Jul 16, 14:50 UTCJul 17, 02:34 UTC11h 45m
2026-07-16 UAL672 SFO → BCN Jul 16, 01:29 UTCJul 16, 11:52 UTC10h 23m
2026-07-16 UAL672 - Jul 16, 01:15 UTCJul 16, 02:45 UTC1h 30m
2026-07-15 UAL59 - Jul 15, 11:20 UTCJul 15, 22:20 UTC11h 0m
2026-07-15 UAL59 FRA → SFO Jul 15, 11:14 UTCJul 15, 22:16 UTC11h 2m
2026-07-14 UAL58 SFO → FRA Jul 14, 21:42 UTCJul 15, 08:04 UTC10h 22m
2026-07-14 UAL58 - Jul 14, 21:50 UTCJul 15, 06:45 UTC8h 54m
2026-07-13 UAL2328 EWR → SFO Jul 13, 19:25 UTCJul 14, 00:20 UTC4h 55m
2026-07-13 UAL148 - Jul 13, 01:10 UTCJul 13, 10:15 UTC9h 5m
2026-07-12 UAL149 - Jul 12, 10:20 UTCJul 12, 10:30 UTC10m
2026-07-12 UAL149 - Jul 12, 10:10 UTCJul 12, 10:30 UTC20m
2026-07-12 UAL149 EWR → GRU Jul 12, 01:01 UTCJul 12, 10:03 UTC9h 2m
2026-07-12 UAL149 - Jul 12, 01:10 UTCJul 12, 01:45 UTC35m
2026-07-11 UAL130 - Jul 11, 09:35 UTCJul 11, 21:55 UTC12h 20m
2026-07-10 UAL803 IAD → HND Jul 10, 17:30 UTCJul 11, 06:45 UTC13h 15m
2026-07-09 UAL919 LHR → IAD Jul 9, 12:17 UTCJul 9, 20:06 UTC7h 49m
2026-07-09 UAL919 LHR → IAD Jul 9, 12:15 UTCJul 9, 20:05 UTC7h 50m
2026-07-09 UAL924 IAD → LHR Jul 9, 03:00 UTCJul 9, 10:00 UTC7h 0m
2026-07-08 UAL885 - Jul 8, 08:45 UTCJul 8, 17:35 UTC8h 50m
2026-07-08 UAL885 FCO → IAD Jul 8, 08:47 UTCJul 8, 17:36 UTC8h 49m
2026-07-07 UAL884 IAD → FCO Jul 7, 21:58 UTCJul 8, 06:16 UTC8h 18m
2026-07-07 UAL884 IAD → FCO Jul 7, 22:10 UTCJul 8, 06:15 UTC8h 5m
2026-07-07 UAL914 CDG → IAD Jul 7, 10:45 UTCJul 7, 18:25 UTC7h 40m
2026-07-06 UAL990 SFO → CDG Jul 6, 22:08 UTCJul 7, 08:11 UTC10h 3m
2026-07-06 UAL990 SFO → CDG Jul 6, 22:20 UTCJul 7, 08:15 UTC9h 55m
2026-07-06 UAL34 KIX → SFO Jul 6, 08:15 UTCJul 6, 17:29 UTC9h 14m
2026-07-06 UAL34 - Jul 6, 08:00 UTCJul 6, 09:05 UTC1h 5m
2026-07-05 UAL35 SFO → KIX Jul 5, 18:35 UTCJul 6, 05:21 UTC10h 46m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N795UA page for operator, model, and routing details .

Mode-S AACC5B frequently asked

What is Mode-S code AACC5B?
AACC5B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N795UA.
Where is Mode-S AACC5B registered?
Mode-S code AACC5B is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is AACC5B broadcasting right now?
Yes. Mode-S AACC5B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AACC5B, octal 52546133, decimal 11,193,435.
What flights does AACC5B operate?
Mode-S AACC5B has broadcast 20 distinct callsigns, including UAL4, UAL22, UAL18, UAL919, UAL58.